// Copyright 2007-2010 Baptiste Lepilleur and The JsonCpp Authors
// Distributed under MIT license, or public domain if desired and
// recognized in your jurisdiction.
// See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE

#ifndef LIB_JSONCPP_JSON_TOOL_H_INCLUDED
#define LIB_JSONCPP_JSON_TOOL_H_INCLUDED

#if !defined(JSON_IS_AMALGAMATION)
    #include <json/config.h>
#endif

// Also support old flag NO_LOCALE_SUPPORT
#ifdef NO_LOCALE_SUPPORT
    #define JSONCPP_NO_LOCALE_SUPPORT
#endif

#ifndef JSONCPP_NO_LOCALE_SUPPORT
    #include <clocale>
#endif

/* This header provides common string manipulation support, such as UTF-8,
 * portable conversion from/to string...
 *
 * It is an internal header that must not be exposed.
 */

namespace Json {
    static inline char getDecimalPoint() {
#ifdef JSONCPP_NO_LOCALE_SUPPORT
        return '\0';
#else
        struct lconv *lc = localeconv();
        return lc ? *(lc->decimal_point) : '\0';
#endif
    }
    
/// Converts a unicode code-point to UTF-8.
    static inline String codePointToUTF8(unsigned int cp) {
        String result;
        
        // based on description from http://en.wikipedia.org/wiki/UTF-8
        
        if (cp <= 0x7f) {
            result.resize(1);
            result[0] = static_cast<char>(cp);
        } else if (cp <= 0x7FF) {
            result.resize(2);
            result[1] = static_cast<char>(0x80 | (0x3f & cp));
            result[0] = static_cast<char>(0xC0 | (0x1f & (cp >> 6)));
        } else if (cp <= 0xFFFF) {
            result.resize(3);
            result[2] = static_cast<char>(0x80 | (0x3f & cp));
            result[1] = static_cast<char>(0x80 | (0x3f & (cp >> 6)));
            result[0] = static_cast<char>(0xE0 | (0xf & (cp >> 12)));
        } else if (cp <= 0x10FFFF) {
            result.resize(4);
            result[3] = static_cast<char>(0x80 | (0x3f & cp));
            result[2] = static_cast<char>(0x80 | (0x3f & (cp >> 6)));
            result[1] = static_cast<char>(0x80 | (0x3f & (cp >> 12)));
            result[0] = static_cast<char>(0xF0 | (0x7 & (cp >> 18)));
        }
        
        return result;
    }
    
    enum {
        /// Constant that specify the size of the buffer that must be passed to
        /// uintToString.
        uintToStringBufferSize = 3 * sizeof(LargestUInt) + 1
    };
    
// Defines a char buffer for use with uintToString().
    using UIntToStringBuffer = char[uintToStringBufferSize];
    
    /** Converts an unsigned integer to string.
     * @param value Unsigned integer to convert to string
     * @param current Input/Output string buffer.
     *        Must have at least uintToStringBufferSize chars free.
     */
    static inline void uintToString(LargestUInt value, char *&current) {
        *--current = 0;
        do {
            *--current = static_cast<char>(value % 10U + static_cast<unsigned>('0'));
            value /= 10;
        } while (value != 0);
    }
    
    /** Change ',' to '.' everywhere in buffer.
     *
     * We had a sophisticated way, but it did not work in WinCE.
     * @see https://github.com/open-source-parsers/jsoncpp/pull/9
     */
    template <typename Iter> Iter fixNumericLocale(Iter begin, Iter end) {
        for (; begin != end; ++begin) {
            if (*begin == ',') {
                *begin = '.';
            }
        }
        return begin;
    }
    
    template <typename Iter> void fixNumericLocaleInput(Iter begin, Iter end) {
        char decimalPoint = getDecimalPoint();
        if (decimalPoint == '\0' || decimalPoint == '.') {
            return;
        }
        for (; begin != end; ++begin) {
            if (*begin == '.') {
                *begin = decimalPoint;
            }
        }
    }
    
    /**
     * Return iterator that would be the new end of the range [begin,end), if we
     * were to delete zeros in the end of string, but not the last zero before '.'.
     */
    template <typename Iter> Iter fixZerosInTheEnd(Iter begin, Iter end) {
        for (; begin != end; --end) {
            if (*(end - 1) != '0') {
                return end;
            }
            // Don't delete the last zero before the decimal point.
            if (begin != (end - 1) && *(end - 2) == '.') {
                return end;
            }
        }
        return end;
    }
    
} // namespace Json

#endif // LIB_JSONCPP_JSON_TOOL_H_INCLUDED
